A computer without antivirus is like a soldier without gun. Imagine what would happen to a soldier in the battlefield with no gun and ammo. Is he safe there? Can he even survive?
Similarly, one should never surf the Internet without having a good antivirus software installed on their computer.
One such good antivirus software I recommend to my readers is Kaspersky Antivirus 2013. Often referred to as KAV 2013, this application is just remarkable in its performance.
I have been using Kaspersky for straight 6 years and believe me, I have never faced a single problem.